from django_redis import get_redis_connection
from rest_framework import serializers

from .models import User
import re

"""
注冊序列化器的功能:
1,驗證數據
2,數據入庫
3,講數據模型轉換爲字典
"""
# serializers.ModelSerializer 根據 fileds 自動生成字段
class RegisterCreateSerializer(serializers.ModelSerializer):

    # 用户再进行提交的时候有3个数据:校验密码,短信验证码,是否同意协议
    # 所以,我们需要定义三个字段
    password2 = serializers.CharField(label='校验密码', allow_null=False, allow_blank=False, write_only=True)
    sms_code = serializers.CharField(label='短信验证码', max_length=6, min_length=6, allow_null=False, allow_blank=False,
                                     write_only=True)
    allow = serializers.CharField(label='是否同意协议', allow_null=False, allow_blank=False, write_only=True)

    token = serializers.CharField(read_only=True)
    # 自定義字段需要添加到 fields 中
    # 进行校验
    # 单个字段的校验有 手机号码,是否同意协议
    def validate_mobile(self, value):
        if not re.match(r'1[3456789]\d{9}', value):
            raise serializers.ValidationError('手机号格式不正确')
        return value

    def validate_allow(self, value):
        # 注意,前段提交的是否同意,我们已经转换为字符串
        if value != 'true':
            raise serializers.ValidationError('您未同意协议')
        return value

    # 多字段校验, 密码是否一致, 短信是否一致
    def validate(self, attrs):

        # 比较密码
        password = attrs['password']
        password2 = attrs['password2']

        if password != password2:
            raise serializers.ValidationError('密码不一致')
        # 比较手机验证码
        # 获取用户提交的验证码
        code = attrs['sms_code']
        # 获取redis中的验证码
        redis_conn = get_redis_connection('code')
        # 获取手机号码
        mobile = attrs['mobile']
        redis_code = redis_conn.get('sms_%s' % mobile)
        if redis_code is None:
            raise serializers.ValidationError('验证码过期')

        if redis_code.decode() != code:
            raise serializers.ValidationError('验证码不正确')

        return attrs

    def create(self, validated_data):

        # 删除多余字段
        del validated_data['password2']
        del validated_data['sms_code']
        del validated_data['allow']

        user = super().create(validated_data)

        # # 调用django的认证系统加密密码
        # user.set_password(validated_data['password'])
        # user.save()

        # 修改密码
        user.set_password(validated_data['password'])
        user.save()

        # 在這裏生成 token
        from rest_framework_jwt.settings import api_settings
        # 补充生成记录登录状态的token
        jwt_payload_handler = api_settings.JWT_PAYLOAD_HANDLER
        jwt_encode_handler = api_settings.JWT_ENCODE_HANDLER

        payload = jwt_payload_handler(user)
        token = jwt_encode_handler(payload)

        user.token = token

        return user

    class Meta:
        model = User
        fields = ('id','token','username','password','mobile','password2','sms_code','allow')
        extra_kwargs = {
            'id': {'read_only': True},
            'username': {
                'min_length': 5,
                'max_length': 20,
                'error_messages': {
                    'min_length': '仅允许5-20个字符的用户名',
                    'max_length': '仅允许5-20个字符的用户名',
                }
            },
            'password': {
                'write_only': True,
                'min_length': 8,
                'max_length': 20,
                'error_messages': {
                    'min_length': '仅允许8-20个字符的密码',
                    'max_length': '仅允许8-20个字符的密码',
                }
            }
        }

class UserCenterInfoSerializer(serializers.ModelSerializer):
    class Meta:
        model = User
        fields = ['id','username','email','mobile','email_active']

class EmailUpdateSerializer(serializers.ModelSerializer):
    class Meta:
        model = User
        fields = ['id','email']
        extra_kwargs = {
            'email':{
                'required':True
            }
        }
    # def update(self, instance, validated_data):
    #     instance.email = validated_data['email']
    #     instance.save()
    #
    #     return instance



    def update(self, instance, validated_data):
        email = validated_data['email']
        instance.email = validated_data['email']
        instance.save()

        # 发送激活邮件
        # 生成激活链接
        from users.utils import generate_verify_email_url
        # verify_url = instance.generate_verify_email_url()
        verify_url = generate_verify_email_url(instance.id,instance.email)
        # 发送,注意调用delay方法

        from celery_tasks.email.tasks import send_verify_mail
        send_verify_mail.delay(email, verify_url)
        return instance

#
from .models import Address
class AddressesCreateSerializer(serializers.ModelSerializer):

    # 序列化的时候使用
    province = serializers.StringRelatedField(read_only=True)
    city = serializers.StringRelatedField(read_only=True)
    district = serializers.StringRelatedField(read_only=True)

    #反序列化的时候使用
    province_id = serializers.IntegerField(label='省ID', required=True)
    city_id = serializers.IntegerField(label='市ID', required=True)
    district_id = serializers.IntegerField(label='区ID', required=True)

    mobile = serializers.RegexField(label='手机号', regex=r'^1[3-9]\d{9}$')

    class Meta:
        model = Address
        exclude = ('user', 'is_deleted', 'create_time', 'update_time')


    def create(self, validated_data):

        # validated_data
        # 没有user

        uesr = self.context['request'].user

        validated_data['user']=uesr

        return super().create(validated_data)

class AddressTitleSerializer(serializers.ModelSerializer):
    """
    地址标题
    """
    class Meta:
        model = Address
        fields = ('title',)



from goods.models import SKU
from django_redis import get_redis_connection

class UserHistroySerializer(serializers.Serializer):
    """
    添加用户浏览记录序列化器
    """
    sku_id = serializers.IntegerField(label='商品编号',min_value=1,required=True)

    def validate_sku_id(self,value):
        """
        检查商品是否存在
        """
        try:
            SKU.objects.get(pk=value)
        except SKU.DoesNotExist:
            raise serializers.ValidationError('商品不存在')

        return value

    def create(self, validated_data):

        #获取用户信息
        user_id = self.context['request'].user.id
        #获取商品id
        sku_id = validated_data['sku_id']
        #连接redis
        redis_conn = get_redis_connection('history')
        #移除已经存在的本记录
        redis_conn.lrem('history_%s'%user_id,0,sku_id)
        #添加新的记录
        redis_conn.lpush('history_%s'%user_id,sku_id)
        #保存最多5条记录
        redis_conn.ltrim('history_%s'%user_id,0,4)

        return validated_data

class SKUSerializer(serializers.ModelSerializer):

    class Meta:
        model = SKU
        fields = ('id', 'name', 'price', 'default_image_url', 'comments')